newtype

src/main.rs

@@ -99,6 +99,14 @@ impl fmt::Display for Point {
 
 impl OutlinePrint for Point {}
 
+struct Wrapper(Vec<String>);
+
+impl fmt::Display for Wrapper {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "[{}]", self.0.join(", "))
+    }
+}
+
 fn main() {
     assert_eq!(
             Point { x: 1, y: 0 } + Point { x: 2, y: 3 },
@@ -119,5 +127,8 @@ fn main() {
     
     let xy = Point { x: 344, y: 576 };
     xy.outline_print();
-    println!("{}", Point {x: 34, y:45})
+    println!("{}", Point {x: 34, y:45});
+        
+    let w = Wrapper(vec![String::from("hello"), String::from("world")]);
+    println!("w = {}", w);
 }